1 Journal of Experimental Criminology (2006) 2: 67Y 98 # Springer 2006 DOI: /s Long-term effects of participation in the Baltimore City drug treatment court: Results from an experimental study DENISE C. GOTTFREDSON, STACY S. NAJAKA, BROOK W. KEARLEY and CARLOS M. ROCHA Department of Criminology and Criminal Justice, The University of Maryland, 2220D LeFrak Hall, College Park, MD 20742, USA * corresponding author: Abstract. This study uses an experimental design comparing 235 offenders assigned either to drug treatment court or treatment as usual. It extends prior analyses of this study sample to examine whether differences observed between drug treatment court subjects and control subjects at one and two years after the start of the program persist after three years, when many of the subjects had ceased active treatment. Further, it extends earlier analyses that showed that the quantity of drug treatment court services received was related to lower recidivism rates by using an instrumental variables approach to handle the endogeneity problem that sometimes arises when subjects self-select into different levels of service. Results show a sustained treatment effect on recidivism, controlling for time at risk. This effect is not limited to the period during which services are delivered. Rather, it persists even after participation in the drug court program ceases. Results also show that the recidivism is lowest among subjects who participate at higher levels in certified drug treatment, status hearings, and drug testing. These positive findings are tempered with findings that more than three-fourths of clients are re-arrested within three years, regardless of participation in the drug treatment court, and that drug treatment court cases spend approximately the same number of days incarcerated as do control cases. Implications for strengthening drug treatment courts are discussed. Key words: drug treatment courts, randomized experiment Introduction Drug treatment courts (DTCs) were first developed in the late 1980s in response to a justice system overburdened by drug crimes. Various social and political forces during that time Y most importantly, the crack cocaine epidemic and the subsequent Fwar on drugs_ Y created an environment in which court dockets were overwhelmed by drug cases and prisons were filled to capacity with drug offenders (Belenko 1993; McColl 1996; Tonry 1995). Practitioners and reformers, impressed with positive results found in the drug treatment literature (Collins and Allison 1983; Wish and Johnson 1986; Anglin and Hser 1990), advanced drug treatment as a strategy to deal with the U.S. drugs/crime problem, and in 1989, the first drug treatment court was instituted in Dade County, Florida (USDOJ 1998). Since that time, DTCs have enjoyed wide support, with the number of courts growing to over 1,000 nationally (Office of Justice Programs Drug Court Clearinghouse and Technical Assistance Project 2004). Internationally, the DTC model has also been adopted by countries such as Canada, Australia, and the UK (Harrison and Scarpitti 2002). Most DTCs involve prompt identification and
2 68 DENISE C. GOTTFREDSON ET AL. placement of eligible offenders, a non-adversarial approach among prosecution and defense counsel, integration of drug treatment services with justice system case processing, frequent drug and alcohol testing, frequent status hearings with the judge, and intensive drug treatment (Drug Courts Program Office 1997). This combination of sanctions, drug treatment, and probation services is expected to reduce levels of substance use and crime as well as improve offender integration into the community by enhancing mental and physical health, social connections, and employment. Much of the existing DTC research and evaluation reports high retention rates and positive outcomes, including criminal justice cost-savings and reductions in crime, drug use and welfare use (Belenko 1998, 1999, 2001; Finigan 1999; Goldkamp and Weiland 1993; Goldkamp et al. 2001a, b; Harrell et al. 1998; Gottfredson and Exum 2002; Gottfredson et al. 2003a, c; Hora et al. 1999; Sechrest et al. 1998; Spohn et al. 2001; Wilson et al. 2002). A meta-analysis of 41 independent evaluations of drug courts (Wilson et al. 2002) concludes that drug courts reduce crime and drug use to a practically meaningful degree, despite concerns about the unreliability of the evidence related to the performance and outcomes of federally-funded drug treatment courts (U.S. General Accounting Office 2002). Many of the individual studies of drug treatment courts, however, are small-scale evaluations which suffer from a number of limitations, including a reliance on pre-post designs for the treatment group only and post-only comparisons of the treatment group with dissimilar comparison groups (Belenko 2001; U.S. General Accounting Office 1997; Wilson et al. 2002). However, studies that compare recidivism rates of drug court clients with those of similar groups of clients who did not receive drug court services generally report more favorable outcomes for drug treatment court clients (Finigan 1999; Goldkamp and Weiland 1993; Gottfredson et al. 1997; Peters and Murrin 1998; Sechrest et al. 1998). A few studies have randomly assigned clients to receive drug court services or not. Results from one of these experiments, the Baltimore City Drug Treatment Court (BCDTC), are summarized below. In another randomized experiment, Deschenes et al. (1995) compared randomly assigned drug court participants to three samples with varying levels of drug testing coupled with supervision and found that drug court participants recidivated at approximately the same rates as the comparison group samples. In this study, the drug court participants were more involved in treatment and counseling during the one-year follow-up period, but less involved in other constructive activities such as employment, community service, payment of fines and restitution, and formal education than the controls, suggesting that the treatment component of the program was not highly effective. Harrell et al. (1998) evaluated a pretrial drug court by comparing offenders who were randomly assigned to receive either drug treatment, drug testing, and judicial monitoring (the drug court); drug testing with graduated sanctions and judicial monitoring; or drug testing and judicial monitoring only. The defendants on both the drug court docket and the docket which included graduated sanctions were significantly less likely to test positive for drugs in the month before sentencing compared with offenders who were not subject to sanctions for noncompliance. These latter two studies
3 DRUG TREATMENT COURT LONG-TERM OUTCOMES 69 suggest that programs including drug testing and sanctions may be as effective as programs that also involve mandatory treatment, although in both studies the treatment component was poorly implemented. In a study involving survival analysis, Peters and Murrin (1998) found that the length of time in drug treatment was significantly related to the number of arrests for both drug court graduates and nongraduates, suggesting that treatment is an important element of the drug court model. These studies have raised important questions about the mechanisms contributing to the effectiveness of drug courts (Longshore et al. 2001). While research has generally concluded that drug courts are effective, precisely why and for whom drug courts work remains largely unknown. The populations involved in the studies to date have varied considerably from moderate drug users to the seriously addicted. A recent study of drug courts in two sites assessed the impact of five drug court elements on four outcome measures (Goldkamp et al. 2001a, b). Indicators of the drug court elements included two measures of participation in treatment, two measures of assignment of sanctions, and the number of court appearances. Outcome measures included graduation, any type of re-arrest, re-arrest for a drug offense, and re-arrest for a non-drug offense. Analyses controlling for risk-related participant attributes produced findings that were both site and outcome variable dependent. Clearly, additional research is needed to better understand the essential elements of the drug court model, and how these elements may differ for different populations. Also, only two studies (Deschenes et al. 1995; Goldkamp et al. 2001a, b) have followed up both DTC clients and control subjects for as long as three years, and few studies have documented continuing DTC effects after the end of active treatment. In fact, none of the studies that used random assignment to treatment and control conditions distinguished between in-program and postprogram recidivism (Belenko 2001). This study addresses some of the weaknesses of prior research. The current research incorporates an experimental design to examine whether differences already observed between drug treatment court subjects and control subjects at one and two years after the start of the program persist after three years, when many of the subjects had ceased active treatment. It compares in-program and post-program recidivism rates. Further, it relates variability in recidivism to variability in the quantity of specific DTC services received using an instrumental variables approach. The Baltimore City Drug Treatment Court 1 The Baltimore City Drug Treatment Court (BCDTC) was established in 1994, largely in response to a report by the Bar Association of Baltimore City (1990) which estimated that nearly 85% of all crimes committed in Baltimore were addiction-driven. Drug court clients are referred from one of two tracks: (1) Circuit Court felony cases supervised by Parole and Probation and (2) District Court misdemeanor cases supervised by Parole and Probation. These two tracks are postconviction tracks, whereby clients generally enter the drug court program as a condition of probation.
4 70 DENISE C. GOTTFREDSON ET AL. In order to be considered for the drug court program, defendants must satisfy several eligibility requirements. They must be at least 18 years of age, reside in Baltimore City, and cannot have any past or current convictions for violent offenses. Once these initial conditions have been met, the process of identifying drug court clients follows several steps. Eligible defendants who express an interest in the program meet with the Public Defender to discuss their possible participation. If after this meeting the defendant remains interested in the drug court program, record checks are completed and reviewed by the State s Attorney. The State s Attorney then meets with the Public Defender to determine which defendants would be best served by the program. Among this subset of defendants, the Psychopathy Checklist (Hare et al. 1990) is administered to evaluate the offenders suitability for the program, and the Addiction Severity Index (McLellan et al. 1992) is administered to assess their motivation and need for treatment. Both tests are administered by personnel in the Drug Court Assessment Unit. Data regarding drug history, medical history, employment status, as well as other aspects of the defendants families and social relations are also collected. Upon the completion of these assessments, the assessor recommends the defendants for the program, or not. The names of eligible defendants are submitted to the drug court docket. The State s Attorney, Public Defender, probation agent, and the defendant then appear before the drug court judge to discuss the case. The judge renders the final decision as to the offender s placement in the drug court program. Program components The BCDTC program combines intensive supervision, drug testing, drug treatment, and judicial monitoring over the course of approximately two years. All defendants enter the program under intensive supervision. The guidelines of the drug court recommend (1) a minimum of three face-to-face contacts per month between defendants and probation officers, (2) two home-visits per month, and (3) verification of employment status once per month. In addition, agents frequently verify other special conditions of probation and regularly review their clients criminal records for recent violations. As defendants near graduation from the drug court program, their level of supervision is downgraded from Fintensive_ to Fstandard high,_ which requires fewer contacts. During the course of their supervision, drug court clients are frequently drug tested. Prior to October of 1998, the frequency of testing varied depending on the clients test results. All clients were initially required to submit two urine samples per week (referred to as phase I testing). After completing one month with no positive tests, clients generally graduated to phase II testing in which tests were completed once every week. After two consecutive months of clean tests, clients progressed to phase III testing. During phase III, clients were required to complete one urinalysis every two weeks, and continued at this rate for the duration of the program. In October of 1998, the testing schedule was revised to reflect a more structured and less individualized schedule. As of that date, all clients are required to provide two urine samples per week for the first three months of the program.
5 DRUG TREATMENT COURT LONG-TERM OUTCOMES 71 During the next three months, tests are completed once per week. Clients are then tested once per month for a period of six months. After that time, urinalyses are completed randomly for as long as the client remains under drug court supervision. In addition to supervision and drug testing, drug court program participants are required to receive treatment from one of eight providers located in the city of Baltimore. Three of the programs provide intensive outpatient services; two provide methadone maintenance; two provide inpatient care; and one provides transitional housing. Drug court clients are assigned to a program based on the type of treatment required, the treatment center s availability, and the location of the treatment center relative to the client s residence. Throughout the program, a drug court judge monitors the defendants progress through regularly scheduled status hearings. Defendants are required to attend status hearings once every two weeks. At these hearings, the judge reviews reports from the probation agent regarding the defendants compliance with the program. Based on these reports, the judge prescribes graduated sanctions as needed. Sanctions usually involve increased contacts with the probation agent, increased status hearings, or increased drug testing. Severe violations generally lead to a violation of probation hearing, during which the judge may re-impose the original sentence which was suspended pending successful completion of the drug court program. Drug court clients become eligible for graduation upon satisfactory completion of the prescribed treatment and compliance with the requirements of supervision. The decision to graduate a defendant must be approved by the Court, the State s Attorney s Office, and the Office of the Public Defender. A graduation ceremony is held to mark the occasion, and defendants friends and family are encouraged to attend. Comparison with other drug courts The BCDTC does not differ substantially from the Ftypical_ drug court in terms of its components. According to recent self-reports of operating drug courts (Office of Justice Programs Drug Court Clearinghouse and Technical Assistance Project 2001), 60% of adult drug courts involve participants both post-conviction and at some other point (e.g., pretrial, probation violators), as did Baltimore during the period covered by this study. Results from an earlier survey of drug courts (Cooper 1997) showed that the typical drug court screens clients for substance use, assigns clients to treatment provided by community-based organizations, requires at least three contacts per week with the treatment provider, two urine tests per week, and weekly or bi-weekly contact with the drug court judge in the initial phases. The typical drug court uses increased frequency of court status hearings, urinalysis, and treatment as sanctions for relapse, and 60% use short periods of incarceration. Finally, the typical drug court imposes incarceration sentences on defendants who are unsuccessfully terminated from the program. The Baltimore drug court is like the typical drug court on these dimensions. It is atypical primarily in the type of
6 72 DENISE C. GOTTFREDSON ET AL. population it serves (mostly African American male heroin addicts), and the active involvement of the Division of Parole and Probation in the operation of the program. For example, initial screening for substance use problems is conducted by this division in Baltimore, but only in 16% of drug courts nationwide. Also, intensive probation supervision is an element of the BCDTC but is not generally found elsewhere. Other unusual aspects of the BCDTC include its large size (as of Spring, 2001, 1,218 clients had either graduated or were currently enrolled) and the extensive screening conducted prior to program participation. Prior research on the Baltimore City Drug Treatment Court Several reports on the success of the BCDTC have been published. Gottfredson et al. (1997) reported the results of an evaluation of the early stages of the BCDTC. In that evaluation, the first 145 offenders assigned to the BCDTC were compared to a group of more than 500 offenders receiving traditional parole and probation services. This short-term (six-month) quasi-experimental evaluation found that after controlling for pre-existing differences across the treatment and comparison groups, participation in the BCDTC program was associated with a 50% decrease in the odds of re-arrest for a new offense. However, the researchers concluded that a more rigorous evaluation was needed in order to yield conclusive results. A randomized experiment of the BCDTC (to be described shortly) began in The first report from this more rigorous study compared the DTC cases with control cases 12 months post-randomization and reported that the drug treatment court subjects were significantly less likely than control subjects to be arrested for new offenses (Gottfredson and Exum 2002). Specifically, 63.5% of control cases were arrested for new offenses versus 48.2% of drug treatment court cases. The drug treatment court sample also had significantly fewer arrests (0.9 vs. 1.3) and significantly fewer charges (1.6 vs. 2.4), as compared to controls. Effects favored the DTC cases for every type of crime examined (except prostitution), but were statistically significant only for violent and sex charges. Findings from the second year of the study showed sustained treatment differences with regard to recidivism (Gottfredson et al. 2003c). Specifically, 66.2% of drug treatment court and 81.3% of control subjects were arrested for a new offense. The number of new arrests (1.6 vs. 2.3) and new charges (3.1 vs. 4.6) were also significantly lower for treatment than control group members, and these difference remained significant even after taking into account time not at risk during the follow-up period due to incarceration. Effects favored the DTC cases for every type of crime examined, but were statistically significant only for drug-related crime charges. This study also compared DTC subjects who participated in treatment with those who did not and with control subjects and reported the treated drug court subjects were significantly less likely to recidivate than both untreated drug court subjects and control subjects. Survival analyses examining time to rearrest in the first 24 months following randomization showed that assignment to the drug court significantly increased
7 DRUG TREATMENT COURT LONG-TERM OUTCOMES 73 time to rearrest (Banks and Gottfredson 2004). When the survival functions were examined separately for drug court cases who actually received drug treatment services and those who did not, again the results showed that attending treatment significantly decreased the risk of failure over a two-year follow-up period (Banks and Gottfredson 2003). The most recent published reports from the evaluation of the BCDTC (Gottfredson et al. 2003a) report results from interviews with a subset of the research subjects who were interviewed during the follow-up period. These analyses demonstrated that the positive program effects on crime are replicated with self-reports. In addition, program participants reported less substance use than controls. Few differences between groups were observed on other outcomes including employment, education, mental and physical health, and family and social relationships, although treatment cases were less likely than controls to be on the welfare rolls at the time of the interview. Taken together, this prior research on the BCDTC has demonstrated that a DTC focusing on a high-rate offending drug-addicted urban population reduces crime and drug use in this population, and that these positive effects persist for at least two years. However, the magnitude of the differences in recidivism rates are not large, the re-arrest rates for DTC clients are high, and, although differences favor DTC cases in all recidivism analyses, the effects in the most recent analysis reach statistical significance only for drug-related crimes. The research also suggests that there is much variability in the quality of services received by DTC clients, and that receiving drug treatment may be important. The research on the importance of drug treatment, however, does not entirely rule out selection effects as an alternative explanation for the better outcomes observed for subjects who happened to receive more drug treatment services. Further, the prior research does not examine (a) variability in outcomes related to other key elements of the DTC (e.g., drug testing and judicial hearings), or (b) the extent to which positive effects persist after subjects have stopped receiving DTC services. As noted earlier, the intent of the DTC model is to break the cycle of drugs and crime. Several of the key elements in the model are designed to provide social and personal supports so that clients will be able to maintain a drug-free lifestyle after the program ends, thereby reducing criminal activity in the longer term. Unless the effect of participation in a DTC program can be shown to extend beyond the period during which services are provided, questions about the utility of the model for achieving the intended effects will persist. This paper seeks to fill these gaps in knowledge about the effectiveness of the BCDTC. Methodology Design The evaluation of the BCDTC utilizes an experimental research design. Beginning in February of 1997, eligible drug court offenders were randomly assigned to the
8 74 DENISE C. GOTTFREDSON ET AL. drug treatment court or to treatment as usual. Assignment occurred just prior to the appearance before the drug court judge. The randomization results were given to the judge as a recommendation and were followed in most cases because the judges had agreed to participate in the study. Randomization continued through August of 1998, at which time 235 clients had been assigned randomly to one of the two conditions. Study participants were randomly assigned at a ratio of one treatment to one control for Circuit Court cases and at a ratio of two treatment to one control for District Court cases. This was done at the request of the District Court judge who was concerned that all drug treatment court slots might not be filled if we kept with a one-to-one ratio. Of the 139 cases randomly assigned to the treatment group, we found records to indicate that 91% were actually dealt with in the drug treatment court. In comparison, approximately 7% of the 96 cases randomly assigned to the control condition were dealt with in the drug treatment court. Data All of the data for this study are from official records of the Maryland Department of Public Safety and Correctional Services and the Baltimore Substance Abuse Systems, Inc. (BSAS), an organization that coordinates drug treatment services in Baltimore. Data were collected on demographic characteristics and prior offense history, as well as recidivism, drug treatment, drug testing, probation supervision, judicial monitoring, and time spent incarcerated in jail and prison through three years following randomization. 2 Note that the measures of participation in the DTC components were fairly superficial, measuring, for example, the duration of drug treatment rather than the content or quality of this treatment. Analysis In all analyses of the effects of the full DTC intervention, subjects were treated as randomized, regardless of their actual treatment. That is, subjects randomly assigned to the drug court were analyzed as members of the treatment group regardless of their actual treatment, and subjects randomly assigned to the control group were analyzed as members of the control group regardless of their actual treatment. This conservative strategy, called an Fintent-to-treat_ (ITT) analysis, was adopted to preserve the comparability of the study groups. Means and proportions were computed for the outcomes of interest for the DTC and control cases. 3 These differences in the means and proportions were also examined by originating court because for some variables, the treatment effect was found to interact with originating court. OLS regression was used to provide significance tests for the DTC/control group comparisons on continuous outcome measures, and logistic regression was used to compare the two groups on dichotomous outcomes. Independent variables in the regression equations included
9 DRUG TREATMENT COURT LONG-TERM OUTCOMES 75 condition (drug court or control), originating court (District or Circuit), and a condition-by-court interaction term. Originating court was included to control for the fact that different ratios of treatment to control cases were used in the randomization procedure in the two courts (see above), which resulted in a correlation between treatment condition and court. A condition by court interaction term allowed us to ascertain whether program outcomes differed by originating court. If the results of the regression indicated that the condition-by-court interaction was not significant, the regression equation was re-estimated without the interaction term. For comparisons of treatment and control cases within court, simple chi-square (for dichotomous outcomes) and t-tests (for continuous outcomes) were used to test for the significance of the differences. An instrumental variables (IV) approach (Angrist 2005; Wooldridge 2002) was also used to estimate the effects on recidivism of the level of participation in various components of the BCDTC. As noted earlier, Gottfredson et al. (2003c) compared DTC subjects who participated in treatment with those who did not and with control subjects and reported the treated drug court subjects were significantly less likely to recidivate than both untreated drug court subjects and control subjects. They cautioned, however, against interpreting that finding to suggest that increased drug treatment reduces crime because unmeasured factors that lead individuals to seek more treatment may also lead them to commit less crime. This type of omitted variable problem, unless corrected, would result in a biased estimate of the effect of treatment on crime. Banks and Gottfredson (2003) attempted to rule out these selection artifacts in the association of participation and recidivism by using statistical controls for demographic characteristics and prior offending. These statistical controls, however, were limited and could not allow the researchers to confidently rule out selection effects. The present analysis uses the two-stage least squares (2SLS) approach to lend further support to causal interpretations of the effects of participation in program components of the BCDTC. The 2SLS approach Y a common form of the more general IV approach Y recognizes that the level of client participation in drug court components is likely to be correlated with the disturbance terms in the OLS regression equation predicting the number of arrests. 4 Under such conditions, an important assumption is violated and OLS yields inconsistent estimators. 5 In IV terminology, the independent variable of interest is considered a Fproblematic causal variable_ because it is correlated with the disturbance term for the dependent variable. IV solves this problem by locating a variable that is both uncorrelated with the disturbance term in the equation of interest and correlated with the problematic causal variable (once the effects of other variables in the equation have been netted out). A variable that meets these conditions is called an IV for the problematic causal variable and is used to essentially remove from the problematic causal variable the portion of variance that is correlated with the disturbance term. This new Fcleaned up_ independent variable is no longer problematic and can be used in a subsequent step to estimate the effect of the independent variable of interest. Although locating an IV that meets the required assumptions can be challenging,
10 76 DENISE C. GOTTFREDSON ET AL. we are fortunate in this study to have an ideal instrument: the variable indicating random assignment to treatment and control conditions. This variable is by definition uncorrelated with the disturbance term in the equation of interest, and it is highly correlated with the level of participation in drug testing, drug treatment, and judicial hearings (although not to the amount of probation supervision received, as will be shown shortly). Angrist (2005) demonstrates the use of the IV method to estimate the effects of treatment in the context of an imperfectly implemented randomized experiment Y the Minneapolis Domestic Assault experiment. In his example, approximately 20% of the cases randomized to receive Fcoddling_ as opposed to arrest as a response to domestic violence were actually arrested. Any attempt to estimate the effect of Fcoddling_ on re-arrest using the actual services received will be biased to the extent that the factors that led police to over-ride the randomization protocol are correlated with re-arrest during the follow-up period. Angrist uses the random assignment variable as an instrument to obtain a corrected estimate of the effect of Bcoddling[ (versus arrest) on subsequent crime. Our use of the IV approach is similar, but uses 2SLS to execute the analysis. As the name implies, 2SLS involves two stages (or more specifically, two regression equations). In the first regression equation, the problematic causal variable is regressed on the instrumental variable(s) and the other determinants of the outcome of interest (i.e., explanatory variables). The resulting coefficients are then used to create a predicted value of the problematic causal variable for each member of the sample. These predicted values include participation induced by random assignment and the other measured covariates, and exclude participation induced by unmeasured factors that might be correlated with recidivism. In the second regression equation, the outcome of interest is regressed on the predicted values of the problematic causal variables and the other determinants of the outcome of interest used in the first equation. Covariates are typically added to both the first and second regression equations for efficiency gain (see Angrist 2005), and the same covariates must be added to the two equations. However, when 2SLS estimates are obtained by running OLS twice, the standard errors will be too large because they are based on the residual sum of squares from the second equation rather than the first. To obtain accurate standard errors, one must calculate the residual sum of squares using the actual value of the regressor after obtaining parameter estimates using the predicted value (Foster and McLanahan 1996). Most statistical packages with a 2SLS procedure automatically perform this correction. In the current study, 2SLS analyses were conducted in SPSS 11.0 for Windows for the problematic participation variables. 6 These analyses essentially created a new participation variable by predicting it from originating court, age, gender, race, number of prior offenses, number of days at risk for a new arrest, and the random treatment assignment variable (the IV). The predicted outcome from this equation contains only the variability in the original implementation variable that is uncorrelated with the error term in the recidivism equation. In the second stage, the number of arrests was regressed on the newly created implementation variable from the first stage and the same control variables included in the equation that
11 DRUG TREATMENT COURT LONG-TERM OUTCOMES 77 produced the predicted implementation variable in stage one. The 2SLS procedure also performs a necessary correction to the standard errors. The coefficient for the corrected implementation variable in the 2SLS solution provides a consistent and unbiased estimate of the effect of participation in the drug treatment court components, assuming that the disturbance on the dependent variable is independent of the IV (random assignment) and that the IV effects the number of arrests only via the participation variable. Results Study participants The participants in this study include the 235 arrestees who were assigned randomly to receive either BCDTC services (N = 139) or treatment as usual in the traditional court (N = 96). Of the 139 cases assigned to the treatment condition, 84 were handled in the District Court and 55 were handled in the Circuit Court. Of the 96 cases assigned to the control condition, 42 were handled in the District Court and 54 were handled in the Circuit Court. The study participants are all adults, with an average age of 35. Approximately 89% are African American and 74% are male. The study subjects have considerable criminal histories. At the time of randomization into the study, the drug court subjects averaged 12 prior arrests, while control subjects averaged 11 prior arrests. Both groups averaged five prior convictions. Comparisons between the two study groups on these background characteristics produced no statistically significant differences, indicating that the randomization procedure produced similar groups. In addition to considerable criminal histories, the study subjects had considerable drug problems. In an earlier evaluation using the same sample, Gottfredson et al. (2003c) summarized Addiction Severity Index data for the drug court subjects based on interviews conducted either by assessment staff prior to randomization or by treatment staff upon entry into treatment. Nearly all (96%) of the drug court sample named heroin or cocaine as their primary drug of choice, and more than half (60%) reported using crack, cocaine, or heroin three or more times per week. These data make clear that unlike some drug courts that serve lower risk offenders whose drug use is not severe, the BCDTC serves a drug-addicted population. Graduation status and program length By the end of the three-year follow-up period, 43 (31%) of the drug court cases had graduated from drug court after spending, on average, nearly 22 months (665 days) participating in the drug court program. Of the remaining 96 cases randomized to the drug court condition, 15 (11%) were still participating or had an open probation case associated with the drug court; 62 (45%) had been terminated from the drug court program due to noncompliance after spending, on average, almost 17 months
12 78 DENISE C. GOTTFREDSON ET AL. (509 days) participating in the program; four (3%) died prior to completing the drug court program; the status of two subjects (1%) could not be determined; and, as noted above, the remaining 13 subjects (9%) were not treated by the court as drug court cases. During the three years following randomization, drug court cases originating in the Circuit Court averaged 720 days in the program while those originating in the District Court averaged 553 days. This finding is not surprising, as program length is expected to be longer for drug court participants handled by the Circuit Court as opposed to the District Court. Response to the initial arrest Table 1 shows the actual days incarcerated as a result of the initial arrest. The estimates of days incarcerated include all periods of incarceration in jail and prison occurring during the three-year follow-up period that were associated with the initial arrest. They capture time served as a direct result of the initial arrest (both pre- and post-disposition), as well as time served due to probation violations, where the term of probation was associated with the initial arrest. For drug court clients, the estimates also include temporary incarceration periods resulting from failure to comply with the requirements of the drug court (e.g., failure to appear for status hearings). The results are presented separately for each court, as experimental condition was found to interact with originating court for two of the measures included on the table. Overall, similar percentages of drug court and control subjects were incarcerated as a result of the initial arrest (89.2% vs. 83.3%). However, drug court subjects were incarcerated significantly more often during the follow-up than controls, averaging 2.3 episodes of incarceration. Despite this difference in the number of times incarcerated, the number of days incarcerated was not significantly different for drug court and control subjects (158.9 vs days). There was however, a large interaction of experimental condition and court. After three years, the District drug court cases wound up spending more than twice as many days incarcerated as their controls and almost as many days incarcerated as the Circuit drug court cases. This result is surprising given previously reported findings that in the Circuit Court, sentences were longer, and the treatment/control difference in the sentence to be served was larger, with control cases expected to spend more days incarcerated than drug court cases (Gottfredson and Exum 2002). Table 1 shows that when the number of incarceration days are separated out by reason, it appears that the difference between the courts in the use of incarceration is in large part explained by the difference between the courts in the use of incarceration in response to noncompliance. There is a large difference between the drug court and control cases in the use of incarceration for noncompliance in the District Court (a difference of 70.6 days) but not the Circuit Court (a difference of only 7.0 days). In short, incarceration was used a lot as a response in the District Court, resulting in more bed space being used by drug court offenders than by those who were processed as usual.
13 DRUG TREATMENT COURT LONG-TERM OUTCOMES 79 Table 1. Days incarcerated as a result of the initial arrest, by originating court. District Circuit Total Treatment Control Treatment Control Treatment Control Percentage incarcerated 91.7 (84) 90.5 (42) 85.5 (55) 77.8 (54) 89.2 (139) 83.3 (96) Incarceration episodes Mean 2.3** (84) 1.4 (42) 2.2 (55) 1.6 (54) 2.3** (139) 1.5 (96) SD Days incarcerated Mean 151.0** (84) 69.0 (42) (55) (54) (139) (96) SD Days incarcerated as a result of: Pre-disposition commitment Mean 12.5* (84) 21.2 (42) 19.2** (55) 51.1 (54) 15.1** (139) 38.0 (96) SD Assigned sentence Mean 5.0 (84) 8.5 (42) 15.9* (55) 78.3 (54) 9.3**. (139) 47.8 (96) SD Response to non-compliance Mean 94.3** (84) 23.7 (42) 85.3 (55) 78.3 (54) 90.7 (139) 54.4 (96) SD Reason unknown Mean 39.2 (84) 15.5 (42) 50.8 (55) 17.6 (54) 43.8* (139) 16.7 (96) SD Numbers in parentheses are the number of cases for which valid data are available. *p G 0.05; **p G Significance tests for the within-court treatment/control comparisons are based on chi-square tests for dichotomous variables and t-tests for continuous variables. Significance tests for the overall treatment/control comparisons are based on logistic regression for dichotomous variables and OLS regression for continuous variables.. Interaction of experimental condition and court is significant, p G 0.05.
14 80 DENISE C. GOTTFREDSON ET AL. Implementation of key program components Data on the level of implementation of the various drug court components, all based on existing court, parole/probation, and treatment records, suggest that the drug court program increased drug testing, judicial monitoring, and drug treatment for drug court clients relative to controls. Table 2 summarizes the amount of supervision (i.e., drug testing, judicial monitoring, and probation supervision) received by the study groups during the three-year follow-up period. Drug court subjects were significantly more likely than control subjects to have been drug tested and to have attended status hearings. Specifically, 86.9% of drug court subjects were tested for drugs, as compared to only 40.2% of control subjects, and 84.2% of drug court subjects attended at least one status hearing, as compared to only 7.3% of control subjects. In addition, the drug court cases attended a significantly greater number of status hearings than controls, and there was a significant interaction of experimental condition and court for the number of status hearings attended. In both the District Court and the Circuit Court, drug court clients attended a significantly greater number of status hearings than control cases. However, the treatment/control difference was larger among Circuit Court cases (a difference of 14.6 hearings) as compared to cases handled in the District Court (a difference of 6.5 hearings), and Circuit drug court cases on average attended twice as many hearings as District drug court cases (15.0 vs. 7.4). No Table 2. Characteristics of supervision, three years after entry into study. Experimental status Treatment Control Percentage drug tested 86.9** (130) 40.2 (92) Percentage with at least one hearing attended 84.2** (139) 7.3 (96) Number of hearings attended All subjects Mean 10.4**. (139) 0.6 (96) SD Percentage supervised 83.3 (138) 85.4 (96) Number of days supervised All subjects Mean (138) (96) SD Supervised subjects Mean (115) (82) SD Numbers in parentheses are the number of cases for which valid data are available. **p G Significance tests for the treatment/control comparisons are based on logistic regression for dichotomous variables and OLS regression for continuous variables.. Interaction of experimental condition and court is significant, p G 0.01.
15 DRUG TREATMENT COURT LONG-TERM OUTCOMES 81 differences were found on measures of probation supervision. 7 Similar percentages of treatment and control subjects received probation supervision during the study period, and the two groups were similar with regard to the number of days supervised. Table 3 summarizes the level of drug treatment services received by the study groups during the three-year follow-up period. In the BCDTC program, a jailbased acupuncture program is used as a sanction for relapsing subjects (Gottfredson et al. 2003c). This program, although considered a treatment, is not recognized as a certified drug treatment program by BSAS, the organization that coordinates drug treatment services in Baltimore. Therefore, it is separated in the table from the other certified drug treatments. The table shows that during the three years following entry into the study, 71.2% of the drug court group received some form of treatment, as compared with 27.1% of the control group (p G.01). When only certified drug treatment is considered, the figures are 53.2% and 22.9% Table 3. Drug treatment experiences, three years after entry into study. Experimental status Treatment Control Percentage receiving Any treatment 71.2** (139) 27.1 (96) Certified drug treatment 53.2** (139) 22.9 (96) Methadone maintenance 7.2 (139) 9.4 (96) Outpatient 30.2** (139) 8.3 (96) Residential 10.1 (139) 7.3 (96) Correctional 2.2 (139) 0.0 (96) Detoxification 2.2 (139) 0.0 (96) Intensive outpatient 20.9** (139) 5.2 (96) Other treatment 2.2 (139) 0.0 (96) Jail-based acupuncture 48.9** (139) 8.3 (96) Duration of treatment (any treatment) All subjects Mean 139.8** (139) 48.4 (96) SD Treated subjects Mean (99) (26) SD Duration of treatment (certified treatment) All subjects Mean 119.9** (139) 45.2 (96) SD Treated subjects Mean (74) (22) SD Numbers in parentheses are the number of cases for which valid data are available. **p G Significance tests for the treatment/control comparisons are based on logistic regression for dichotomous variables and OLS regression for continuous variables.
16 82 DENISE C. GOTTFREDSON ET AL. (p G.01). 8 After jail-based acupuncture, the most common types of treatment for drug court participants were outpatient and intensive outpatient, and differences on these two treatment types were statistically significant. Among all subjects, the number of days in any treatment and the number of days in certified treatment were significantly higher for drug court cases. Drug court clients averaged days in treatment, with of these days devoted to certified treatment. Among subjects who received treatment, the number of days in treatment did not significantly differ by experimental status. This variability in services received is exploited in a subsequent analysis examining the effects of different levels of service provision on recidivism. Recidivism Table 4 summarizes the recidivism outcomes of the study sample during the three years following the date of randomization into the study. The table also shows the 95% confidence intervals around each estimate. Prior to conducting the recidivism analysis, the two study groups were compared on the number of days at risk to reoffend during the follow-up. The comparison showed that the time at risk for a new arrest did not differ for drug court and control cases overall. However, there was an interaction of experimental condition and court. In the District Court, drug court cases were less at risk for a new arrest than controls, while in the Circuit Court, drug court cases were more at risk for a new arrest than controls. Because of this difference, both the mean number of new arrests and the mean number of new arrests per 1,000 days at risk are reported. The figures presented in the table favor the drug court cases on nearly every measure, with comparisons producing significant differences on a number of the outcomes. Drug court subjects were less likely than control subjects to be rearrested, although this difference did not quite reach statistical significance ( p =.05). Specifically, 78.4% of drug court and 87.5% of control subjects were rearrested. The number of new arrests was significantly lower for drug court cases as compared to controls (2.3 vs. 3.4), and this difference remained significant after factoring in time at risk for a new offense. When results are broken out by type of charge involved in the arrest, drug court subjects were less likely than controls to be arrested for every category of offense except weapons (in which the two groups were equal) and Fother_ charges. However, the differences are statistically significant only for drug offenses. In-program vs. post-program recidivism The recidivism findings reported above indicate that the BCDTC is reducing crime. However, the outcomes presented in Table 4 do not differentiate in-program recidivism from post-program recidivism. Table 5 presents a comparison of DTC effects during and after the end of program services. This analysis speaks to the
17 DRUG TREATMENT COURT LONG-TERM OUTCOMES 83 Table 4. Three-year recidivism outcomes. Experimental status Treatment Control Percentage re-arrested 78.4 (71.5Y85.3) 87.5 (80.8Y94.2) Percentage re-convicted 58.3 (49.8Y66.9) 64.4 (54.4Y74.5) Average number of new arrests 2.3** (1.9Y2.8) 3.4 (2.7Y4.0) Average number of new arrests per 1000 days at risk 3.8** (2.9Y4.6) 5.8 (4.3Y7.3) Average number of new charges 4.4* (3.4Y5.4) 6.1 (4.8Y7.4) Average number of new convictions 1.2 (0.9Y1.5) 1.3 (0.9Y1.7) Percentage of subjects with at least one new: Violent or sex charge 14.4 (8.3Y20.5) 24.7 (15.8Y33.7) Property charge 35.1 (26.9Y43.3) 40.4 (30.3Y50.5) Drug charge 55.5* (47.1Y63.9) 68.4 (58.9Y77.9) Prostitution/Solicitation charge 5.3 (1.4Y9.2) 6.7 (1.4Y11.9) Public order charge 36.0 (27.9Y44.2) 46.3 (36.1Y56.5) Weapons charge 4.5 (0.9Y8.1) 4.5 (0.1Y8.9) Other charge 1.5 (j0.6y3.7) 1.1 (j1.1y3.4) 95% confidence intervals appear in parentheses. Number of treatment subjects with valid data ranges from 124 to 139. Number of control subjects with valid data ranges from 81 to 96. *p G 0.05; **p G Significance tests for the treatment/control comparisons are based on logistic regression for dichotomous variables and OLS regression for continuous variables. DTC model s ability to alter the behavior of its clients beyond the period during which services are provided. The table shows the mean number of arrests per 100 days at risk during participation in the drug court program as well as following participation. For the drug court cases, the three-year follow-up was divided into three periods: pre-program, in-program, and post-program. Comparable periods of time were established for the control cases using the mean number of days in each period for the drug court cases (namely, 26 days pre-program, 617 days inprogram, and 452 days post-program). Once the in-program and post-program periods were identified, the mean number of arrests was estimated for each, controlling for time at risk. The figures reported are limited to the drug court and control cases who were treated as randomized. That is, they exclude cases randomized to the drug court condition who were not dealt with in the drug court and cases randomized to the control condition who were dealt with in the drug court. In addition, the number of arrests per days at risk is based only on the subjects at risk for at least one day during the period of interest. Table 5 shows that during both the in-program period and the post-program period, the drug court cases had fewer new arrests as compared to control cases. During their participation in the drug court, treatment cases averaged 0.45 arrests per 100 days at risk, while controls averaged 0.66 arrests during this same time period (p G.05). Following their participation in the drug court, treatment cases averaged 0.32 arrests per 100 days at risk, while controls averaged 0.56 arrests (p G.05). The table also reports these differences expressed as standardized mean difference effect sizes. 9 Effect sizes less than 0.20 are generally considered small.
18 84 DENISE C. GOTTFREDSON ET AL. Table 5. In-program and post-program arrests. In-program Arrests/100 Days at risk a N ES (T vs. C) Post-program Arrests/100 Days at risk a N ES (T vs. C) Treatment b 0.45* (125) * (90) 0.32 Control c 0.66 (88) 0.56 (80) a Includes only those subjects at risk for at least one day during the period of interest. b Excludes subjects randomly assigned to the drug court who were not dealt with in the drug court. c Excludes subjects randomly assigned to the control group who were dealt with in the drug court. *Difference between treatment and control groups is significant, p G Significance tests based on OLS regression. However, the practical significance of an effect size depends in large part on the seriousness of the outcome, since even small effects may lead to meaningful reductions in criminal behavior (Lipsey 1992). In this instance, the effect sizes are 0.26 for in-program arrests and 0.32 for post-program arrests. Taken together, these findings suggest that the effect of the BCDTC on recidivism is not limited to the period during which services are delivered, but rather, the effect persists after participation in the drug court program ceases. Recidivism as a function of level of implementation Variability in the amount of drug treatment, drug testing, judicial monitoring, and probation supervision received by the drug court subjects permits a comparison of the recidivism outcomes of clients who received more of these services with the outcomes of those who received less. To explore the relationship between participation in these four components and re-offending, categories reflecting varying levels of service were defined for each drug court component. For treatment, the categories are (1) 0 days of certified treatment, (2) 1 to 178 days of certified treatment, and (3) 179 or more days of certified treatment. Since a substantial number of subjects received no certified treatment, untreated subjects were placed in a single category. The median number of certified treatment days among subjects who received any treatment was used as the cut-point for defining the two groups of treated subjects. For drug testing, the categories are (1) 0 tests and (2) 1 or more tests, as the drug testing data available for the study only capture participation in drug testing. For status hearings, the categories are (1) 0 to 10 hearings attended and (2) 11 or more hearings attended. Finally, the categories for supervision are (1) 0 to 441 days of supervision and (2) 442 or more days of supervision. The categories for these last two program components were defined using the median value of the sample for each. The association between level of participation in each of the four drug court components and mean number of arrests during the three year follow-up period, for
19 DRUG TREATMENT COURT LONG-TERM OUTCOMES 85 the drug court cases only, is shown in Table 6. For all four components, subjects who received more services were re-arrested less often than subjects who received fewer services. Comparisons of the high implementation group with the lower implementation group(s) produced significant differences for three of the four program components. Specifically, drug court subjects in the high implementation categories for certified treatment, drug testing, and status hearings were re-arrested significantly less often than drug court subjects in the respective low implementation categories. 10 In the case of probation supervision, subjects who were supervised 442 or more days recidivated less often than subjects who were supervised between 0 and 441 days, however this difference was not significant. The far right column of the table reports the differences between the highest implementation groups and the lower implementation groups expressed as standardized mean difference effect sizes. The effect sizes range from a low of 0.12 for arrests by amount of supervision, to a high of 1.37 for arrests by participation in drug testing. These findings suggest that higher levels of implementation of the key drug court components are associated with larger reductions in recidivism. However, it is possible that the differences observed between the high and low implementation groups on mean arrests reflect selection bias rather than, or in addition to, effects of participation in the drug court services. That is, the relationship between higher levels of service and reduced recidivism may be due to unmeasured variables predicting both. To the extent that unmeasured variables influence both participation and recidivism, the effects of participation are overestimated in the results reported in Table 6. Several steps were taken to better understand the extent and consequences of selection bias. These additional analyses used both drug treatment court cases and control cases in order to make use of all of the available variation in the participation variables and to increase power. First, we tested for endogeneity in equations predicting number of arrests from each of the three participation variables shown to be significantly related to recidivism in Table 6. Using OLS, we regressed the categorical 11 versions of each of the three program components (status hearings, certified drug treatment, and drug testing) on the variable reflecting the random assignment to treatment or control, plus several control variables that might influence both recidivism and level of participation: originating court, age, gender, race, number of prior arrests, and number of days at risk for a new arrest. Residuals from these equations (representing unmeasured variables that influence participation) were then entered into OLS equations predicting number of arrests from each of the three participation variables (separately) as well as the same set of controls just listed. If the residuals from the first equation significantly predict the number of arrests, we have evidence of endogeneity in the equations of interest. The residuals from the status hearings and certified drug treatment equations were not significantly related to number of subsequent arrests, once the available controls were employed. This suggests that the unmeasured variables that determine the level of participation in these services are not related to the number of subsequent arrests, net of the available controls, and therefore OLS estimates of the effect of
20 86 DENISE C. GOTTFREDSON ET AL. Table 6. Variability in implementation of the drug court components (drug court cases only). Drug court component Treatment ES a Mean arrests SD N Certified treatment 0 days 3.28** 3.34 (65) 0.67 (0 days vs. 179 or more days) 1Y178 days (34) 0.20 (1Y178 days vs. 179 or more days) 179 or more days (40) Drug testing 0 tests 5.24** 4.05 (17) 1.37 (0 tests vs. 1 or more tests) 1 or more tests (113) Status hearings 0Y10 hearings 2.84** 2.94 (79) 0.44 (0Y10 hearings vs. 11 or more hearings) 11 or more hearings (60) Supervision 0Y441 days (71) 0.12 (0Y441 days vs. 442 or more days) 442 or more days (67) a Standardized mean difference effect size; based on mean difference between low or medium implementation treatment group and high implementation treatment group. **Difference between low implementation group and high implementation group is significant, p G Significance tests based on t-tests.
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